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4f1bcaf094
VGA_MAP_MEM translates to ioremap() on some architectures. It makes sense to do this to vga_vram_base, because we're going to access memory between vga_vram_base and vga_vram_end. But it doesn't really make sense to map starting at vga_vram_end, because we aren't going to access memory starting there. On ia64, which always has to be different, ioremapping vga_vram_end gives you something completely incompatible with ioremapped vga_vram_start, so vga_vram_size ends up being nonsense. As a bonus, we often know the size up front, so we can use ioremap() correctly, rather than giving it a zero size. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
/*
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* Access to VGA videoram
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*
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* (c) 1998 Martin Mares <mj@ucw.cz>
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*/
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#ifndef _LINUX_ASM_VGA_H_
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#define _LINUX_ASM_VGA_H_
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#include <asm/io.h>
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#define VT_BUF_HAVE_RW
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#define VT_BUF_HAVE_MEMSETW
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#define VT_BUF_HAVE_MEMCPYW
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extern inline void scr_writew(u16 val, volatile u16 *addr)
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{
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if (__is_ioaddr(addr))
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__raw_writew(val, (volatile u16 __iomem *) addr);
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else
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*addr = val;
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}
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extern inline u16 scr_readw(volatile const u16 *addr)
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{
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if (__is_ioaddr(addr))
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return __raw_readw((volatile const u16 __iomem *) addr);
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else
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return *addr;
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}
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extern inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
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{
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if (__is_ioaddr(s))
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memsetw_io((u16 __iomem *) s, c, count);
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else
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memsetw(s, c, count);
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}
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/* Do not trust that the usage will be correct; analyze the arguments. */
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extern void scr_memcpyw(u16 *d, const u16 *s, unsigned int count);
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/* ??? These are currently only used for downloading character sets. As
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such, they don't need memory barriers. Is this all they are intended
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to be used for? */
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#define vga_readb(a) readb((u8 __iomem *)(a))
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#define vga_writeb(v,a) writeb(v, (u8 __iomem *)(a))
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#define VGA_MAP_MEM(x,s) ((unsigned long) ioremap(x, s))
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#endif
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